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Stock-Based Compensation and Employee Benefit Plans (Restricted Stock Units) (Narrative) (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognition period   2 years 2 months 12 days    
Performance Based Restricted Stock Units (PRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of PRSUs granted (in shares) | shares 37,143   194,207  
Ratio eligible for possible vesting   0.3333   0.3333
Maximum earnings, percentage of baseline awards 136.00% 150.00%    
Performance period   12 months    
Weighted average grant date fair value (in dollars per share) | $ / shares $ 6.71 $ 4.67    
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of PRSUs granted (in shares) | shares   1,671,806    
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 6.02    
Unrecognized compensation cost | $   $ 12    
Recognition period   2 years 7 months 14 days    
Second Performance Plan | Performance Based Restricted Stock Units (PRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of PRSUs granted (in shares) | shares   138,953    
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 5.19    
Third Performance Plan | Performance Based Restricted Stock Units (PRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of PRSUs granted (in shares) | shares   60,684    
Weighted average grant date fair value (in dollars per share) | $ / shares   $ 5.35